Facet Orientation and Intermediate Phase Regulation via a Green Antisolvent for High‐Performance Perovskite Solar Cells

Abstract

Herein, isobutanol (IBA) as a new type of green antisolvent for improving the performance of perovskite solar cells (PSCs) is demonstrated. Compared to the commonly used chlorobenzene (CB), IBA treatment enables a preferred (111) crystal orientation, better crystallinity, enlarged grain size of the perovskite film, and penetrated grain crystal throughout the film. IBA antisolvent can effectively suppress the formation of δ-phase and favor the formation of α-phase during perovskite film crystallization. The superior crystal quality and preferred (111) orientation are attributed to the different interactions of DMSO with FA þ induced by the introduction of IBA. As a result, a higher open circuit voltage and improved power conversion efficiency are achieved in three different compositions of PSCs compared with the conventionally used CB antisolvent, suggesting the universality of this method. The results offer instructive insight into searching for a new antisolvent in further potential applications of PSCs.

Customizing a Coordinative Crab Molecule BCP‐3N with Multifunctionality for High‐Performance Inverted Perovskite Solar Cells

“…At the same time, a strong peak corresponding to PbI 2 appears at 12.9°, which is consistent with the report mentioned above. [ 43 ] Encouragingly, after adding the BCP and BCP‐3N into the ethanol antisolvent to passivates these Pb(II) defects, the peak intensity of PbI 2 was significantly reduced with BCP as a comparison, suggesting that the stronger coordination ability of BCP‐3N to PbI 2 has effectively restrained its further accumulation. In addition, further analysis of the lattice parameters showed that the half‐peak width of the film treated with BCP‐3N was narrower (Table S3, Supporting Information), indicating the perovskite grain size in the bulk phase was larger, which was confirmed by cross‐sectional scanning electron microscope (SEM) in Figure S6, Supporting Information, as well.…”

Facet Engineering: A Promising Pathway toward Highly Efficient and Stable Perovskite Photovoltaics

“…In addition, other methods such as component engineering, additive engineering, and antisolvent engineering can also be able to regulate the crystal orientation to a certain extent, but it seems difficult to achieve quasi-monocrystalline films with a single dominant orientation. 32,33,43,53 A comparison of various regulation methods and their core factors affecting the facet orientation is shown in Table 1.…”

“…This work is a breakthrough of the restrictions on the conventional preferential (001) orientation, expanding the breadth of seeding-induced growth on individually tailored dominant facet orientations. In addition, other methods such as component engineering, additive engineering, and antisolvent engineering can also be able to regulate the crystal orientation to a certain extent, but it seems difficult to achieve quasi-monocrystalline films with a single dominant orientation. ,,, A comparison of various regulation methods and their core factors affecting the facet orientation is shown in Table .…”

(111)‐Dominated Perovskite Films by Antisolvent Engineering

“…Wang et al reported that isobutanol cound regulate the mesophase of perovskite and enables (111)‐oriented perovskite film. [ 28 ] However, there is still lack of systematic studies on the relationship between the intermediates, nucleation, and film orientation, especially the nucleation mechanism of perovskite thin films before annealing.…”